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NBME 20 Answers

nbme20/Block 3/Question#7

A 10-year-old boy has a palpable mass in the ...

Endoderm of foramen caecum

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 +3  upvote downvote
submitted by xxabi(123),

This is a thyroglossal duct cyst. The tyroglossal duct may persist and result in a thyroglossal duct cyst (occurring in midline near hyoid bone or at the base of the tongue), thus will classically move up with swallowing or tongue protrusion.

The foramen cecum (of the tongue) is the normal remnant of the thyroglossal duct

lilyo  I got it wrong though because the question clearly asks what does this structure (thyroglossal duct) DEVELOP from, not this structure eventually develops to form which structure. If it asked that then I would have picked option A but because it didnt that was the first option I crossed out. +2  

 +0  upvote downvote
submitted by hungrybox(295),

The endoderm of the 3rd and 4th pouches form the parathyroid gland and the parafollicular cells of the thyroid gland.